Monday, November 19, 2012

8 Angles: ὀκτάγωνον & Leonardo Fibonacci & Castel Del Monte

Castel Del Monte
It was created by Leonardo Fibonacci and  
commissioned by Emperor Frederick II of Sweden.
It's an external octagon with 
an internal octagon with  8 octagonal towers 
at all  8 corners.

In geometry, an octagon 
(from the Greek ὀκτάγωνον oktágōnon, "eight angles")
 is a regular polygon that has eight sides. 
A regular octagon is represented 
by the Schläfli symbol {8}.


Leonardo Pisano Bigollo (c. 1170 – c. 1250) 
also known as Leonardo of Pisa, Leonardo Pisano,
 Leonardo Bonacci, Leonardo Fibonacci, 
or, most commonly, simply Fibonacci, 
was an Italian mathematician, considered by some 
"the most talented western mathematician 
of the Middle Ages." Fibonacci is best known 
to the modern world for the spreading 
of the Hindu–Arabic numeral system in Europe
primarily through the publication in 1202 
of his Liber Abaci (Book of Calculation), 
and for a number sequence 
named the Fibonacci numbers after him, 
which he did not discover 
but used as an example in the Liber Abaci.


Castel Del Monte 
(Italian: Castle of the Mount
 is a 13th-century citadel and castle 
situated in Andria 
in the Apulia region of southeast Italy
It stands on a promontory, 
where it was constructed 
during the 1240s by the Emperor Frederick II
who had inherited the lands 
from his mother Constance of Sicily
In the 18th century, the castle's interior marbles 
and remaining furnishings were removed. 
It has neither a moat nor a drawbridge 
and some considered it never to have been intended 
as a defensive fortress; 
however, archaeological work has suggested 
that it originally had a curtain wall. 
 Described by the Enciclopedia Italiana as  
"the most fascinating castle built by Frederick II"
the site is protected as a World Heritage Site.


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